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Re: Raising CYA with Dichlor

If your CYA was basically pure and your gallons is correct, pool calc says you should be closer to 30ppm, but the test uncertainty is at least +/- 10ppm.

I would check CYA again after 4lb dichlor, if it's still lower than you like then use another pound. Yes, the CYA from dichlor should be available pretty quickly.

In general you're best off doing only one thing to the pool at a time, so I'd wait on borates until the CYA was where you want. In particular, as I recall dichlor is a bit acidic so you'd want to make sure the pH is where you want it before you do the borates.
--paulr